18 8)

b)

b)

20 a)

0)

A1108

Power consumed in the circuit (ii) Power factor of the circui

an R-L-C series circuit with R=10 Q, L=0.1 H and c=16 Ns 1

alternating voltage source. Determine the impedance (i) at réSonant frequency,
(1110 Hz above resonant frequency and (iii) 10 Hz below resonant frequency.
Draw the variation of impedance with respect to frequency of an R-L-C series
circuit.

Module VI
Compare star and delta connected three phase power supply systems.

A three-phase delta connected load consists of three similar impedances of
(1012) Q. Find the line current and total power absorbed if it is connected to a
415V, 50Hz supply.

Calculate the phase and line currents and the load impedance parameters in a
balanced delta connected load which consumes a power of 25 kW at 0.866 power
factor lag fed from a three phase 400V, 50 Hz supply.

A balanced three phase load consumes a power of 10 kW at 0.9 pf lag. If the
power is measured by two wattmeter method, calculate the readings of the two

watt-meters.
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